revision vs alteration

revision and alteration both are nouns.

Word	Noun	Adjective	Verb	Adverb
revision	Yes	No	No	No
alteration	Yes	No	No	No

As nouns, revision and alteration are synonyms defined as:

revision and alteration: the act of revising or altering (involving reconsideration and modification)

revision (noun)	alteration (noun)
the act of revising or altering (involving reconsideration and modification)	the act of revising or altering (involving reconsideration and modification)
something that has been written again	the act of making something different (as e.g. the size of a garment)
the act of rewriting something	an event that occurs when something passes from one state or phase to another